Combined venting valve and coupling for medical drainage tubes



FIG. 1 is a front elevational view of a combined venting valve and coupling for medical drainage tubes, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof, the opposite being identical thereto;

FIG. 5 is a perspective view thereof; and

FIG. 6 is an enlarged fragmentary perspective view showing details of the vent portion. 

The ornamental design for a combined venting valve and coupling for medical drainage tubes, as shown and described. 